Catégorie : Séminaire 2023/2024

Titre : TBD Résumé :

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Titre : Scattering by a Random Thin Coating of Nanoparticles Résumé : This is a joint work with Laure Giovangigli and Amandine Boucart.We study the time-harmonic scattering by a heterogeneous object covered with a thin layer of randomly distributed nanoparticles. The size of the particles, their distance between each other…

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Titre : Contrôle optimal en ferromagnétisme : temps minimal de retournement de la magnétisation Résumé : Dans cet exposé, je considère un matériau ferromagnétique de forme ellipsoïdale soumis à un champ magnétique externe. La magnétisation du matériau vérifie, dans ce cas, l’équation de Landau-Lifshitz. Je m’intéresse à la question suivante…

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Titre : Adipose tissue dynamics modeling Résumé : Adipose tissue, made of adipocyte cells (also known as fat cells), is central in many physiological pathways involved in obesity-related diseases. Clarifying the dynamics of adipocytes size and number evolution is crucial to better understand the pathophysiological basis of those diseases. We…

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Titre : Neural Operator Surrogates for Elliptic PDEs Résumé : Approximating solution sets of PDEs is an important task for many applications such as model order reduction and uncertainty quantification. In this talk, we consider the problem of approximating the solution operator of a PDE, viewed as a (nonlinear) map…

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Titre : Flow simulations in large-scale fractured porous media Résumé : In underground environments, fractures are numerous and present at all scales (from cm to km), with very heterogeneous properties. The most commonly used model for fractured rocks is the Discrete Fracture Matrix (DFM) model, in which fractures are represented…

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Titre : Collocated Simulation of Incompressible Flows on Node-Based Octrees Résumé : Incompressible fluid flows are ubiquitous in science and engineering applications and lie at the heart of numerous research questions. Developing control strategies to minimize drag, understanding arterial wall deformation in the human heart, and even optimizing the energy…

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Titre : Heterogeneous domain decomposition methods Résumé : Heterogeneous domain decomposition methods are domain decomposition methods where one does not solve the same equation in each subdomain. There are two reasons for this to occur: first the physics are different in different regions, and second, the physics is the same,…

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Titre : Une méthode de reconstruction pour le problème inverse gravimétrique Résumé : Dans le cas d’une densité constante, le problème inverse gravimétrique se ramène à un problème inverse géométrique. La méthode de reconstruction proposée repose sur le calcul des moments harmoniques du domaine recherché. Une fois l’algorithme détaillé, des…

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Titre : Shallow Water models for viscoplastic flows Résumé : We present some developments on the Saint Venant equations from the Navier-Stokes-Bingham model. Specific finite volume schemes are designed to deal with the yield stress of the constitutive law. Comparisons with dam-break physical experiments will also be discussed.

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